4yerars old-will take couple of minutes before galning speed of 2 miles per hour .was working excellent till yesterday

0.2mile per hour
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releasing the gas pedal and it gets going again
not very safe

is the engine light on
could be any faulty sensor in this engine diagram

maf clean might help
if a spark issue needs chasing
it could be a fuel problem
maybe bad fuel or blocked fuel filter

Knot is a measure of speed. Knot per hour is a measure of acceleration. Are you sure you want 49 knots per hour?

49 knots is about 56.4 miles per hour or about 90.7 kilometers per hour. A good pace for a car and a very good pace for a boat.

49 knots per hour is about 56.4 miles per hour per hour or about 90.7 kilometers per hour per hour. Not a very good performance if a car or a boat takes an hour to get up to that speed.

There could be a couple of reasons for this to happen, what is your RPM at Max Speed?
If your RPM are Maxing out, you are having problems with your Belt or Primary Clutch
If your RPM are NOT Maxing out, then you have a fuel blockage and / or your High Speed Jets are too small for your Altitude.

try to sync the carbs, if you can not sync them, you have to change the slow and main jet. You can check how to sync the carbs on YouTube.

The average ball speed for a bowling is about 10 miles per hour to15 miles per hour with professional bowlers averaging about 20 to 25 miles perhour, the power of the throw depends on the bowling game type you're playingand your physical strength. You can improve your throwing speed by practicingyour throws and strengthening you forearm.

Shaking like that is generally associated with most commonly, unbalanced tires. You also should have the driveshaft universals checked for excess play. Either can give you a shake at certain speeds.

it sounds like air in the fuel line or a carburator/fuel injector problem

is the fuel old?

my old vehicles that have been sitting run MUCH better if I give them new fuel

I lost the manual to the pro-form 520. How do you tighten the belt? Where can I order a new or find the on line manual?